Jackass star Steve-O is nursing a broken nose after a TV stunt with boxer Mike Tyson' went too far.The zany stuntman stunned the audience at Charlie Sheen's Comedy Central Roast on Saturday (10Sep11) after repeatedly slamming his face into Tyson's hand. He later took to his Twitter.com page to thank Tyson for the injury, writing, "Tonight I asked Mike Tyson for a black eye and I wound up with two black eyes and a broken nose. Thanks so much, Brother! @MikeTyson." Steve-O assured fans he'll show off his bruises soon, adding, "I would post a photo of how messed up my face is now, but I'm going to look so much more awesome tomorrow, it's going to be worth the wait."